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(NoModeL) A c. RANDALL.

CHEMICAL TELEGRAPH. v No. 245.214, Patented Aug. 2, 18.81..

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UNITED STATES PATENT OFFICE.

CHARLES A. RANDALL, OF NEW YORK, N. Y.

CHEMICAL TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 245,214, dated August 2, 1881.

Application filed June 2, 1881. (No model.)

T all whom it may concern:

Be it known that I, OHARLEsA. RANDALL, a citizen of the United'States, residing at New York, in thecounty of New York and State of New York, have invented new and useful Improvements in Chemical Telegraphs, of which the followingis a specification. Thisinvention relates tochemical telegraphy in which a chemically-prepared paper is used in connection with an iron or steel pen for recording; and it consists in certain improvements in the receiving and recording apparatus, by means of which the pressure of the pen upon the paper is automatically adjusted and rendered uniform and positive.

In the accompanying drawings, Figure 1 represents a side elevation of that part of the apparatus which contains my improvements, and Fig. 2 a cross-section on the line as w of Fig. 1.

In telegraph apparatus of this class as heretofore constructed the iron pen being inserted in the circuit, and serving as a conductor of the current to the paper and drum of the receiving apparatus at the point of con tact of the pen with the paper at the passage of the current, bythe electric action the pen is gradually consumed, so thatits contact with the paper is rendered variable and often broken and therecord madeimperfeet or entirely obliterated, and hence frequent adjustment of the pen is necessitated. To obviate this difficulty of recordin g with the chemical or fast system of telegraphy this invention especially applies and it consists in automatically feeding the recording-pen in such manner that the contact is uniform and positively assured. This may be effected in various ways on the same general plan and' involving the same general principles as in the apparatus herein described. I have found the devices herein shown by the drawings to be effective.

In the drawings, the letter A marks the receiving drum or roller of a suitable chemicaltelegraph receiving apparatus, supported upon standard B. The drum may be rotated by-any suitable power.

To the standard 0 is pivoted an arm, D, to which are fulcrumed the arms a a at b. The

' position and movement of the arm a may be adjusted by-two eccentric stop-screws, c c. The arms a a carry rollers d d, respectively, the roller d bearing upon the flanges of the drum A, as shown in Fig. 2, and the roller d pressing upon the recording-pen, and being also in contact with the roller'd, by which it is revolved, the pressure of said roller oldepending upon the tension of the spring f that bears upon the lever to, and which spring is also secured to D. The arm it extends beyond the fulcrum 11, passing between the stopscrews 0 c, and to this arm a is secured a guide-piece, 9, through which passes the recording-pen h, the same passing down between the rollers d (1 upon the paper on the drum A, which paper is moved thereon as the drum revolves by the pressure of the roller it upon the lever I, also secured loosely to the arm D, the pressure of contact of said roller upon the drum depending upon the tension of the adjustable spring 8. As the drum A revolves the roller (1 is also revolved, it in turn revolving the roller d, the pressure upon the pen between the same tending to pull the pen down between them until it touches the paper, and thus securing a uniform and positive contact of the pen upon the paper.

What I claim as my invention is- 1. In a chemical-telegraph receiving and recording apparatus, the combination, with a loosely-suspended recording-pen, of automatic devices acting to positively advance the pen onto the paper with a uniform pressure, substan tially as described.

2. In a chemical-telegraph receiving and recording apparatus, the combination, with arecording-pen, of an automatic adjustable feeding device acting to positively advance the pen in a straight line onto the paper with a uniform pressure and an invariable position, substantially as described.

3. In a chemical-telegraph receiving and recording apparatus, the combination, with the receiving drum or roller and recording-pen, of devices automatically operated by the rotation of the receiving drum or roller, and acting to positively advance the pen onto the paper with a uniform pressure, substantially as described.

4. In a chemical-telegraph receiving and recording instrument, the combination, withthe recording-pen and the guide piece or holder, of means operating to automatically and positively feed the pen from its guide piece or holder with a uniform pressure, substantially as described.

5. In a chemical-telegraph receiving and re- In testimony whereof I have hereunto set eori'linginstrument, the combination, with the my hand in the presence of two subscribing recording-pen, of two rollers driven from the Witnesses.

receiving drum orrollerof theinstrumenb, and CHARLES A. RANDALL. 5 acting to automatically adjust the pen onto Witnesses:

the paper in a positive and uniform manner, 1. G. RANDALL,

substantially as described. GEO. M. BAKER. 

